Merge branch 'en/strmap'

A specialization of hashmap that uses a string as key has been
introduced.  Hopefully it will see wider use over time.

* en/strmap:
  shortlog: use strset from strmap.h
  Use new HASHMAP_INIT macro to simplify hashmap initialization
  strmap: take advantage of FLEXPTR_ALLOC_STR when relevant
  strmap: enable allocations to come from a mem_pool
  strmap: add a strset sub-type
  strmap: split create_entry() out of strmap_put()
  strmap: add functions facilitating use as a string->int map
  strmap: enable faster clearing and reusing of strmaps
  strmap: add more utility functions
  strmap: new utility functions
  hashmap: provide deallocation function names
  hashmap: introduce a new hashmap_partial_clear()
  hashmap: allow re-use after hashmap_free()
  hashmap: adjust spacing to fix argument alignment
  hashmap: add usage documentation explaining hashmap_free[_entries]()

27 files changed, 621 insertions, 170 deletions

diff --git a/Makefile b/Makefile
index dd1cf41e00..d3a531d3c6 100644
--- a/Makefile
+++ b/Makefile
@@ -1004,6 +1004,7 @@ LIB_OBJS += stable-qsort.o
 LIB_OBJS += strbuf.o
 LIB_OBJS += streaming.o
 LIB_OBJS += string-list.o
+LIB_OBJS += strmap.o
 LIB_OBJS += strvec.o
 LIB_OBJS += sub-process.o
 LIB_OBJS += submodule-config.o
diff --git a/add-interactive.c b/add-interactive.c
index 555c4abf32..a14c0feaa2 100644
--- a/add-interactive.c
+++ b/add-interactive.c
@@ -557,7 +557,7 @@ static int get_modified_files(struct repository *r,
 		if (ps)
 			clear_pathspec(&rev.prune_data);
 	}
-	hashmap_free_entries(&s.file_map, struct pathname_entry, ent);
+	hashmap_clear_and_free(&s.file_map, struct pathname_entry, ent);
 	if (unmerged_count)
 		*unmerged_count = s.unmerged_count;
 	if (binary_count)
diff --git a/attr.c b/attr.c
index a826b2ef1f..4ef85d668b 100644
--- a/attr.c
+++ b/attr.c
@@ -52,13 +52,6 @@ static inline void hashmap_unlock(struct attr_hashmap *map)
 	pthread_mutex_unlock(&map->mutex);
 }
 
-/*
- * The global dictionary of all interned attributes.  This
- * is a singleton object which is shared between threads.
- * Access to this dictionary must be surrounded with a mutex.
- */
-static struct attr_hashmap g_attr_hashmap;
-
 /* The container for objects stored in "struct attr_hashmap" */
 struct attr_hash_entry {
 	struct hashmap_entry ent;
@@ -80,11 +73,14 @@ static int attr_hash_entry_cmp(const void *unused_cmp_data,
 	return (a->keylen != b->keylen) || strncmp(a->key, b->key, a->keylen);
 }
 
-/* Initialize an 'attr_hashmap' object */
-static void attr_hashmap_init(struct attr_hashmap *map)
-{
-	hashmap_init(&map->map, attr_hash_entry_cmp, NULL, 0);
-}
+/*
+ * The global dictionary of all interned attributes.  This
+ * is a singleton object which is shared between threads.
+ * Access to this dictionary must be surrounded with a mutex.
+ */
+static struct attr_hashmap g_attr_hashmap = {
+	HASHMAP_INIT(attr_hash_entry_cmp, NULL)
+};
 
 /*
  * Retrieve the 'value' stored in a hashmap given the provided 'key'.
@@ -96,9 +92,6 @@ static void *attr_hashmap_get(struct attr_hashmap *map,
 	struct attr_hash_entry k;
 	struct attr_hash_entry *e;
 
-	if (!map->map.tablesize)
-		attr_hashmap_init(map);
-
 	hashmap_entry_init(&k.ent, memhash(key, keylen));
 	k.key = key;
 	k.keylen = keylen;
@@ -114,9 +107,6 @@ static void attr_hashmap_add(struct attr_hashmap *map,
 {
 	struct attr_hash_entry *e;
 
-	if (!map->map.tablesize)
-		attr_hashmap_init(map);
-
 	e = xmalloc(sizeof(struct attr_hash_entry));
 	hashmap_entry_init(&e->ent, memhash(key, keylen));
 	e->key = key;
diff --git a/blame.c b/blame.c
index 9156ebeafd..a5044fcfaa 100644
--- a/blame.c
+++ b/blame.c
@@ -435,7 +435,7 @@ static void get_fingerprint(struct fingerprint *result,
 
 static void free_fingerprint(struct fingerprint *f)
 {
-	hashmap_free(&f->map);
+	hashmap_clear(&f->map);
 	free(f->entries);
 }
 
diff --git a/bloom.c b/bloom.c
index 68c73200a5..b176f28f53 100644
--- a/bloom.c
+++ b/bloom.c
@@ -229,10 +229,9 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
 	diffcore_std(&diffopt);
 
 	if (diff_queued_diff.nr <= settings->max_changed_paths) {
-		struct hashmap pathmap;
+		struct hashmap pathmap = HASHMAP_INIT(pathmap_cmp, NULL);
 		struct pathmap_hash_entry *e;
 		struct hashmap_iter iter;
-		hashmap_init(&pathmap, pathmap_cmp, NULL, 0);
 
 		for (i = 0; i < diff_queued_diff.nr; i++) {
 			const char *path = diff_queued_diff.queue[i]->two->path;
@@ -287,7 +286,7 @@ struct bloom_filter *get_or_compute_bloom_filter(struct repository *r,
 		}
 
 	cleanup:
-		hashmap_free_entries(&pathmap, struct pathmap_hash_entry, entry);
+		hashmap_clear_and_free(&pathmap, struct pathmap_hash_entry, entry);
 	} else {
 		for (i = 0; i < diff_queued_diff.nr; i++)
 			diff_free_filepair(diff_queued_diff.queue[i]);
diff --git a/builtin/difftool.c b/builtin/difftool.c
index 7ac432b881..6e18e623fd 100644
--- a/builtin/difftool.c
+++ b/builtin/difftool.c
@@ -342,7 +342,10 @@ static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
 	const char *workdir, *tmp;
 	int ret = 0, i;
 	FILE *fp;
-	struct hashmap working_tree_dups, submodules, symlinks2;
+	struct hashmap working_tree_dups = HASHMAP_INIT(working_tree_entry_cmp,
+							NULL);
+	struct hashmap submodules = HASHMAP_INIT(pair_cmp, NULL);
+	struct hashmap symlinks2 = HASHMAP_INIT(pair_cmp, NULL);
 	struct hashmap_iter iter;
 	struct pair_entry *entry;
 	struct index_state wtindex;
@@ -383,10 +386,6 @@ static int run_dir_diff(const char *extcmd, int symlinks, const char *prefix,
 	rdir_len = rdir.len;
 	wtdir_len = wtdir.len;
 
-	hashmap_init(&working_tree_dups, working_tree_entry_cmp, NULL, 0);
-	hashmap_init(&submodules, pair_cmp, NULL, 0);
-	hashmap_init(&symlinks2, pair_cmp, NULL, 0);
-
 	child.no_stdin = 1;
 	child.git_cmd = 1;
 	child.use_shell = 0;
diff --git a/builtin/fetch.c b/builtin/fetch.c
index f9c3c49f14..ecf8537605 100644
--- a/builtin/fetch.c
+++ b/builtin/fetch.c
@@ -393,7 +393,7 @@ static void find_non_local_tags(const struct ref *refs,
 		item = refname_hash_add(&remote_refs, ref->name, &ref->old_oid);
 		string_list_insert(&remote_refs_list, ref->name);
 	}
-	hashmap_free_entries(&existing_refs, struct refname_hash_entry, ent);
+	hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);
 
 	/*
 	 * We may have a final lightweight tag that needs to be
@@ -428,7 +428,7 @@ static void find_non_local_tags(const struct ref *refs,
 		**tail = rm;
 		*tail = &rm->next;
 	}
-	hashmap_free_entries(&remote_refs, struct refname_hash_entry, ent);
+	hashmap_clear_and_free(&remote_refs, struct refname_hash_entry, ent);
 	string_list_clear(&remote_refs_list, 0);
 	oidset_clear(&fetch_oids);
 }
@@ -573,7 +573,7 @@ static struct ref *get_ref_map(struct remote *remote,
 		}
 	}
 	if (existing_refs_populated)
-		hashmap_free_entries(&existing_refs, struct refname_hash_entry, ent);
+		hashmap_clear_and_free(&existing_refs, struct refname_hash_entry, ent);
 
 	return ref_map;
 }
diff --git a/builtin/shortlog.c b/builtin/shortlog.c
index 0a5c4968f6..c52e4ccd19 100644
--- a/builtin/shortlog.c
+++ b/builtin/shortlog.c
@@ -10,6 +10,7 @@
 #include "shortlog.h"
 #include "parse-options.h"
 #include "trailer.h"
+#include "strmap.h"
 
 static char const * const shortlog_usage[] = {
 	N_("git shortlog [<options>] [<revision-range>] [[--] <path>...]"),
@@ -169,60 +170,6 @@ static void read_from_stdin(struct shortlog *log)
 	strbuf_release(&oneline);
 }
 
-struct strset_item {
-	struct hashmap_entry ent;
-	char value[FLEX_ARRAY];
-};
-
-struct strset {
-	struct hashmap map;
-};
-
-#define STRSET_INIT { { NULL } }
-
-static int strset_item_hashcmp(const void *hash_data,
-			       const struct hashmap_entry *entry,
-			       const struct hashmap_entry *entry_or_key,
-			       const void *keydata)
-{
-	const struct strset_item *a, *b;
-
-	a = container_of(entry, const struct strset_item, ent);
-	if (keydata)
-		return strcmp(a->value, keydata);
-
-	b = container_of(entry_or_key, const struct strset_item, ent);
-	return strcmp(a->value, b->value);
-}
-
-/*
- * Adds "str" to the set if it was not already present; returns true if it was
- * already there.
- */
-static int strset_check_and_add(struct strset *ss, const char *str)
-{
-	unsigned int hash = strhash(str);
-	struct strset_item *item;
-
-	if (!ss->map.table)
-		hashmap_init(&ss->map, strset_item_hashcmp, NULL, 0);
-
-	if (hashmap_get_from_hash(&ss->map, hash, str))
-		return 1;
-
-	FLEX_ALLOC_STR(item, value, str);
-	hashmap_entry_init(&item->ent, hash);
-	hashmap_add(&ss->map, &item->ent);
-	return 0;
-}
-
-static void strset_clear(struct strset *ss)
-{
-	if (!ss->map.table)
-		return;
-	hashmap_free_entries(&ss->map, struct strset_item, ent);
-}
-
 static void insert_records_from_trailers(struct shortlog *log,
 					 struct strset *dups,
 					 struct commit *commit,
@@ -253,7 +200,7 @@ static void insert_records_from_trailers(struct shortlog *log,
 		if (!parse_ident(log, &ident, value))
 			value = ident.buf;
 
-		if (strset_check_and_add(dups, value))
+		if (!strset_add(dups, value))
 			continue;
 		insert_one_record(log, value, oneline);
 	}
@@ -291,7 +238,7 @@ void shortlog_add_commit(struct shortlog *log, struct commit *commit)
 				      log->email ? "%aN <%aE>" : "%aN",
 				      &ident, &ctx);
 		if (!HAS_MULTI_BITS(log->groups) ||
-		    !strset_check_and_add(&dups, ident.buf))
+		    strset_add(&dups, ident.buf))
 			insert_one_record(log, ident.buf, oneline_str);
 	}
 	if (log->groups & SHORTLOG_GROUP_COMMITTER) {
@@ -300,7 +247,7 @@ void shortlog_add_commit(struct shortlog *log, struct commit *commit)
 				      log->email ? "%cN <%cE>" : "%cN",
 				      &ident, &ctx);
 		if (!HAS_MULTI_BITS(log->groups) ||
-		    !strset_check_and_add(&dups, ident.buf))
+		    strset_add(&dups, ident.buf))
 			insert_one_record(log, ident.buf, oneline_str);
 	}
 	if (log->groups & SHORTLOG_GROUP_TRAILER) {
diff --git a/config.c b/config.c
index 2bdff4457b..8f324ed3a6 100644
--- a/config.c
+++ b/config.c
@@ -1963,7 +1963,7 @@ void git_configset_clear(struct config_set *cs)
 		free(entry->key);
 		string_list_clear(&entry->value_list, 1);
 	}
-	hashmap_free_entries(&cs->config_hash, struct config_set_element, ent);
+	hashmap_clear_and_free(&cs->config_hash, struct config_set_element, ent);
 	cs->hash_initialized = 0;
 	free(cs->list.items);
 	cs->list.nr = 0;
diff --git a/diff.c b/diff.c
index ace4a1d387..643f4f3f6d 100644
--- a/diff.c
+++ b/diff.c
@@ -6315,9 +6315,9 @@ static void diff_flush_patch_all_file_pairs(struct diff_options *o)
 			if (o->color_moved == COLOR_MOVED_ZEBRA_DIM)
 				dim_moved_lines(o);
 
-			hashmap_free_entries(&add_lines, struct moved_entry,
+			hashmap_clear_and_free(&add_lines, struct moved_entry,
 						ent);
-			hashmap_free_entries(&del_lines, struct moved_entry,
+			hashmap_clear_and_free(&del_lines, struct moved_entry,
 						ent);
 		}
 
diff --git a/diffcore-rename.c b/diffcore-rename.c
index 99e63e90f8..d367a6d244 100644
--- a/diffcore-rename.c
+++ b/diffcore-rename.c
@@ -407,7 +407,7 @@ static int find_exact_renames(struct diff_options *options)
 		renames += find_identical_files(&file_table, i, options);
 
 	/* Free the hash data structure and entries */
-	hashmap_free_entries(&file_table, struct file_similarity, entry);
+	hashmap_clear_and_free(&file_table, struct file_similarity, entry);
 
 	return renames;
 }
diff --git a/dir.c b/dir.c
index ebea5f1f91..d637461da5 100644
--- a/dir.c
+++ b/dir.c
@@ -817,8 +817,8 @@ static void add_pattern_to_hashsets(struct pattern_list *pl, struct path_pattern
 
 clear_hashmaps:
 	warning(_("disabling cone pattern matching"));
-	hashmap_free_entries(&pl->parent_hashmap, struct pattern_entry, ent);
-	hashmap_free_entries(&pl->recursive_hashmap, struct pattern_entry, ent);
+	hashmap_clear_and_free(&pl->parent_hashmap, struct pattern_entry, ent);
+	hashmap_clear_and_free(&pl->recursive_hashmap, struct pattern_entry, ent);
 	pl->use_cone_patterns = 0;
 }
 
@@ -921,8 +921,8 @@ void clear_pattern_list(struct pattern_list *pl)
 		free(pl->patterns[i]);
 	free(pl->patterns);
 	free(pl->filebuf);
-	hashmap_free_entries(&pl->recursive_hashmap, struct pattern_entry, ent);
-	hashmap_free_entries(&pl->parent_hashmap, struct pattern_entry, ent);
+	hashmap_clear_and_free(&pl->recursive_hashmap, struct pattern_entry, ent);
+	hashmap_clear_and_free(&pl->parent_hashmap, struct pattern_entry, ent);
 
 	memset(pl, 0, sizeof(*pl));
 }
diff --git a/hashmap.c b/hashmap.c
index 09813e1a46..5009471800 100644
--- a/hashmap.c
+++ b/hashmap.c
@@ -92,8 +92,9 @@ static void alloc_table(struct hashmap *map, unsigned int size)
 }
 
 static inline int entry_equals(const struct hashmap *map,
-		const struct hashmap_entry *e1, const struct hashmap_entry *e2,
-		const void *keydata)
+			       const struct hashmap_entry *e1,
+			       const struct hashmap_entry *e2,
+			       const void *keydata)
 {
 	return (e1 == e2) ||
 	       (e1->hash == e2->hash &&
@@ -101,7 +102,7 @@ static inline int entry_equals(const struct hashmap *map,
 }
 
 static inline unsigned int bucket(const struct hashmap *map,
-		const struct hashmap_entry *key)
+				  const struct hashmap_entry *key)
 {
 	return key->hash & (map->tablesize - 1);
 }
@@ -113,6 +114,7 @@ int hashmap_bucket(const struct hashmap *map, unsigned int hash)
 
 static void rehash(struct hashmap *map, unsigned int newsize)
 {
+	/* map->table MUST NOT be NULL when this function is called */
 	unsigned int i, oldsize = map->tablesize;
 	struct hashmap_entry **oldtable = map->table;
 
@@ -133,6 +135,7 @@ static void rehash(struct hashmap *map, unsigned int newsize)
 static inline struct hashmap_entry **find_entry_ptr(const struct hashmap *map,
 		const struct hashmap_entry *key, const void *keydata)
 {
+	/* map->table MUST NOT be NULL when this function is called */
 	struct hashmap_entry **e = &map->table[bucket(map, key)];
 	while (*e && !entry_equals(map, *e, key, keydata))
 		e = &(*e)->next;
@@ -148,7 +151,7 @@ static int always_equal(const void *unused_cmp_data,
 }
 
 void hashmap_init(struct hashmap *map, hashmap_cmp_fn equals_function,
-		const void *cmpfn_data, size_t initial_size)
+		  const void *cmpfn_data, size_t initial_size)
 {
 	unsigned int size = HASHMAP_INITIAL_SIZE;
 
@@ -171,22 +174,37 @@ void hashmap_init(struct hashmap *map, hashmap_cmp_fn equals_function,
 	map->do_count_items = 1;
 }
 
-void hashmap_free_(struct hashmap *map, ssize_t entry_offset)
+static void free_individual_entries(struct hashmap *map, ssize_t entry_offset)
+{
+	struct hashmap_iter iter;
+	struct hashmap_entry *e;
+
+	hashmap_iter_init(map, &iter);
+	while ((e = hashmap_iter_next(&iter)))
+		/*
+		 * like container_of, but using caller-calculated
+		 * offset (caller being hashmap_clear_and_free)
+		 */
+		free((char *)e - entry_offset);
+}
+
+void hashmap_partial_clear_(struct hashmap *map, ssize_t entry_offset)
 {
 	if (!map || !map->table)
 		return;
-	if (entry_offset >= 0) { /* called by hashmap_free_entries */
-		struct hashmap_iter iter;
-		struct hashmap_entry *e;
-
-		hashmap_iter_init(map, &iter);
-		while ((e = hashmap_iter_next(&iter)))
-			/*
-			 * like container_of, but using caller-calculated
-			 * offset (caller being hashmap_free_entries)
-			 */
-			free((char *)e - entry_offset);
-	}
+	if (entry_offset >= 0)  /* called by hashmap_clear_entries */
+		free_individual_entries(map, entry_offset);
+	memset(map->table, 0, map->tablesize * sizeof(struct hashmap_entry *));
+	map->shrink_at = 0;
+	map->private_size = 0;
+}
+
+void hashmap_clear_(struct hashmap *map, ssize_t entry_offset)
+{
+	if (!map || !map->table)
+		return;
+	if (entry_offset >= 0)  /* called by hashmap_clear_and_free */
+		free_individual_entries(map, entry_offset);
 	free(map->table);
 	memset(map, 0, sizeof(*map));
 }
@@ -195,11 +213,13 @@ struct hashmap_entry *hashmap_get(const struct hashmap *map,
 				const struct hashmap_entry *key,
 				const void *keydata)
 {
+	if (!map->table)
+		return NULL;
 	return *find_entry_ptr(map, key, keydata);
 }
 
 struct hashmap_entry *hashmap_get_next(const struct hashmap *map,
-			const struct hashmap_entry *entry)
+				       const struct hashmap_entry *entry)
 {
 	struct hashmap_entry *e = entry->next;
 	for (; e; e = e->next)
@@ -210,8 +230,12 @@ struct hashmap_entry *hashmap_get_next(const struct hashmap *map,
 
 void hashmap_add(struct hashmap *map, struct hashmap_entry *entry)
 {
-	unsigned int b = bucket(map, entry);
+	unsigned int b;
+
+	if (!map->table)
+		alloc_table(map, HASHMAP_INITIAL_SIZE);
 
+	b = bucket(map, entry);
 	/* add entry */
 	entry->next = map->table[b];
 	map->table[b] = entry;
@@ -225,11 +249,15 @@ void hashmap_add(struct hashmap *map, struct hashmap_entry *entry)
 }
 
 struct hashmap_entry *hashmap_remove(struct hashmap *map,
-					const struct hashmap_entry *key,
-					const void *keydata)
+				     const struct hashmap_entry *key,
+				     const void *keydata)
 {
 	struct hashmap_entry *old;
-	struct hashmap_entry **e = find_entry_ptr(map, key, keydata);
+	struct hashmap_entry **e;
+
+	if (!map->table)
+		return NULL;
+	e = find_entry_ptr(map, key, keydata);
 	if (!*e)
 		return NULL;
 
@@ -249,7 +277,7 @@ struct hashmap_entry *hashmap_remove(struct hashmap *map,
 }
 
 struct hashmap_entry *hashmap_put(struct hashmap *map,
-				struct hashmap_entry *entry)
+				  struct hashmap_entry *entry)
 {
 	struct hashmap_entry *old = hashmap_remove(map, entry, NULL);
 	hashmap_add(map, entry);
diff --git a/hashmap.h b/hashmap.h
index b011b394fe..7251687d73 100644
--- a/hashmap.h
+++ b/hashmap.h
@@ -96,7 +96,7 @@
  *         }
  *
  *         if (!strcmp("end", action)) {
- *             hashmap_free_entries(&map, struct long2string, ent);
+ *             hashmap_clear_and_free(&map, struct long2string, ent);
  *             break;
  *         }
  *     }
@@ -210,6 +210,9 @@ struct hashmap {
 
 /* hashmap functions */
 
+#define HASHMAP_INIT(fn, data) { .cmpfn = fn, .cmpfn_data = data, \
+				 .do_count_items = 1 }
+
 /*
  * Initializes a hashmap structure.
  *
@@ -228,24 +231,72 @@ struct hashmap {
  * prevent expensive resizing. If 0, the table is dynamically resized.
  */
 void hashmap_init(struct hashmap *map,
-			 hashmap_cmp_fn equals_function,
-			 const void *equals_function_data,
-			 size_t initial_size);
+		  hashmap_cmp_fn equals_function,
+		  const void *equals_function_data,
+		  size_t initial_size);
 
-/* internal function for freeing hashmap */
-void hashmap_free_(struct hashmap *map, ssize_t offset);
+/* internal functions for clearing or freeing hashmap */
+void hashmap_partial_clear_(struct hashmap *map, ssize_t offset);
+void hashmap_clear_(struct hashmap *map, ssize_t offset);
 
 /*
- * Frees a hashmap structure and allocated memory, leaves entries undisturbed
+ * Frees a hashmap structure and allocated memory for the table, but does not
+ * free the entries nor anything they point to.
+ *
+ * Usage note:
+ *
+ * Many callers will need to iterate over all entries and free the data each
+ * entry points to; in such a case, they can free the entry itself while at it.
+ * Thus, you might see:
+ *
+ *    hashmap_for_each_entry(map, hashmap_iter, e, hashmap_entry_name) {
+ *      free(e->somefield);
+ *      free(e);
+ *    }
+ *    hashmap_clear(map);
+ *
+ * instead of
+ *
+ *    hashmap_for_each_entry(map, hashmap_iter, e, hashmap_entry_name) {
+ *      free(e->somefield);
+ *    }
+ *    hashmap_clear_and_free(map, struct my_entry_struct, hashmap_entry_name);
+ *
+ * to avoid the implicit extra loop over the entries.  However, if there are
+ * no special fields in your entry that need to be freed beyond the entry
+ * itself, it is probably simpler to avoid the explicit loop and just call
+ * hashmap_clear_and_free().
  */
-#define hashmap_free(map) hashmap_free_(map, -1)
+#define hashmap_clear(map) hashmap_clear_(map, -1)
 
 /*
- * Frees @map and all entries.  @type is the struct type of the entry
- * where @member is the hashmap_entry struct used to associate with @map
+ * Similar to hashmap_clear(), except that the table is no deallocated; it
+ * is merely zeroed out but left the same size as before.  If the hashmap
+ * will be reused, this avoids the overhead of deallocating and
+ * reallocating map->table.  As with hashmap_clear(), you may need to free
+ * the entries yourself before calling this function.
+ */
+#define hashmap_partial_clear(map) hashmap_partial_clear_(map, -1)
+
+/*
+ * Similar to hashmap_clear() but also frees all entries.  @type is the
+ * struct type of the entry where @member is the hashmap_entry struct used
+ * to associate with @map.
+ *
+ * See usage note above hashmap_clear().
+ */
+#define hashmap_clear_and_free(map, type, member) \
+	hashmap_clear_(map, offsetof(type, member))
+
+/*
+ * Similar to hashmap_partial_clear() but also frees all entries.  @type is
+ * the struct type of the entry where @member is the hashmap_entry struct
+ * used to associate with @map.
+ *
+ * See usage note above hashmap_clear().
  */
-#define hashmap_free_entries(map, type, member) \
-	hashmap_free_(map, offsetof(type, member));
+#define hashmap_partial_clear_and_free(map, type, member) \
+	hashmap_partial_clear_(map, offsetof(type, member))
 
 /* hashmap_entry functions */
 
@@ -261,7 +312,7 @@ void hashmap_free_(struct hashmap *map, ssize_t offset);
  * and if it is on stack, you can just let it go out of scope).
  */
 static inline void hashmap_entry_init(struct hashmap_entry *e,
-					unsigned int hash)
+				      unsigned int hash)
 {
 	e->hash = hash;
 	e->next = NULL;
@@ -303,8 +354,8 @@ static inline unsigned int hashmap_get_size(struct hashmap *map)
  * to `hashmap_cmp_fn` to decide whether the entry matches the key.
  */
 struct hashmap_entry *hashmap_get(const struct hashmap *map,
-				const struct hashmap_entry *key,
-				const void *keydata);
+				  const struct hashmap_entry *key,
+				  const void *keydata);
 
 /*
  * Returns the hashmap entry for the specified hash code and key data,
@@ -337,7 +388,7 @@ static inline struct hashmap_entry *hashmap_get_from_hash(
  * call to `hashmap_get` or `hashmap_get_next`.
  */
 struct hashmap_entry *hashmap_get_next(const struct hashmap *map,
-			const struct hashmap_entry *entry);
+				       const struct hashmap_entry *entry);
 
 /*
  * Adds a hashmap entry. This allows to add duplicate entries (i.e.
@@ -357,7 +408,7 @@ void hashmap_add(struct hashmap *map, struct hashmap_entry *entry);
  * Returns the replaced entry, or NULL if not found (i.e. the entry was added).
  */
 struct hashmap_entry *hashmap_put(struct hashmap *map,
-				struct hashmap_entry *entry);
+				  struct hashmap_entry *entry);
 
 /*
  * Adds or replaces a hashmap entry contained within @keyvar,
@@ -379,8 +430,8 @@ struct hashmap_entry *hashmap_put(struct hashmap *map,
  * Argument explanation is the same as in `hashmap_get`.
  */
 struct hashmap_entry *hashmap_remove(struct hashmap *map,
-					const struct hashmap_entry *key,
-					const void *keydata);
+				     const struct hashmap_entry *key,
+				     const void *keydata);
 
 /*
  * Removes a hashmap entry contained within @keyvar,
@@ -422,7 +473,7 @@ struct hashmap_entry *hashmap_iter_next(struct hashmap_iter *iter);
 
 /* Initializes the iterator and returns the first entry, if any. */
 static inline struct hashmap_entry *hashmap_iter_first(struct hashmap *map,
-		struct hashmap_iter *iter)
+						       struct hashmap_iter *iter)
 {
 	hashmap_iter_init(map, iter);
 	return hashmap_iter_next(iter);
diff --git a/merge-recursive.c b/merge-recursive.c
index d0214335a7..f736a0f632 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -2651,7 +2651,7 @@ static struct string_list *get_renames(struct merge_options *opt,
 		free(e->target_file);
 		string_list_clear(&e->source_files, 0);
 	}
-	hashmap_free_entries(&collisions, struct collision_entry, ent);
+	hashmap_clear_and_free(&collisions, struct collision_entry, ent);
 	return renames;
 }
 
@@ -2870,7 +2870,7 @@ static void initial_cleanup_rename(struct diff_queue_struct *pairs,
 		strbuf_release(&e->new_dir);
 		/* possible_new_dirs already cleared in get_directory_renames */
 	}
-	hashmap_free_entries(dir_renames, struct dir_rename_entry, ent);
+	hashmap_clear_and_free(dir_renames, struct dir_rename_entry, ent);
 	free(dir_renames);
 
 	free(pairs->queue);
@@ -3497,7 +3497,7 @@ static int merge_trees_internal(struct merge_options *opt,
 		string_list_clear(entries, 1);
 		free(entries);
 
-		hashmap_free_entries(&opt->priv->current_file_dir_set,
+		hashmap_clear_and_free(&opt->priv->current_file_dir_set,
 					struct path_hashmap_entry, e);
 
 		if (clean < 0) {
diff --git a/name-hash.c b/name-hash.c
index fb526a3775..5d3c7b12c1 100644
--- a/name-hash.c
+++ b/name-hash.c
@@ -726,6 +726,6 @@ void free_name_hash(struct index_state *istate)
 		return;
 	istate->name_hash_initialized = 0;
 
-	hashmap_free(&istate->name_hash);
-	hashmap_free_entries(&istate->dir_hash, struct dir_entry, ent);
+	hashmap_clear(&istate->name_hash);
+	hashmap_clear_and_free(&istate->dir_hash, struct dir_entry, ent);
 }
diff --git a/object.c b/object.c
index 05544bc92b..68f80b0b3d 100644
--- a/object.c
+++ b/object.c
@@ -532,7 +532,7 @@ void raw_object_store_clear(struct raw_object_store *o)
 	close_object_store(o);
 	o->packed_git = NULL;
 
-	hashmap_free(&o->pack_map);
+	hashmap_clear(&o->pack_map);
 }
 
 void parsed_object_pool_clear(struct parsed_object_pool *o)
diff --git a/oidmap.c b/oidmap.c
index 423aa014a3..286a04a53c 100644
--- a/oidmap.c
+++ b/oidmap.c
@@ -27,7 +27,7 @@ void oidmap_free(struct oidmap *map, int free_entries)
 		return;
 
 	/* TODO: make oidmap itself not depend on struct layouts */
-	hashmap_free_(&map->map, free_entries ? 0 : -1);
+	hashmap_clear_(&map->map, free_entries ? 0 : -1);
 }
 
 void *oidmap_get(const struct oidmap *map, const struct object_id *key)
diff --git a/patch-ids.c b/patch-ids.c
index 12aa6d494b..21973e4933 100644
--- a/patch-ids.c
+++ b/patch-ids.c
@@ -71,7 +71,7 @@ int init_patch_ids(struct repository *r, struct patch_ids *ids)
 
 int free_patch_ids(struct patch_ids *ids)
 {
-	hashmap_free_entries(&ids->patches, struct patch_id, ent);
+	hashmap_clear_and_free(&ids->patches, struct patch_id, ent);
 	return 0;
 }
 
diff --git a/range-diff.c b/range-diff.c
index 24dc435e48..b9950f10c8 100644
--- a/range-diff.c
+++ b/range-diff.c
@@ -232,11 +232,9 @@ static int patch_util_cmp(const void *dummy, const struct patch_util *a,
 
 static void find_exact_matches(struct string_list *a, struct string_list *b)
 {
-	struct hashmap map;
+	struct hashmap map = HASHMAP_INIT((hashmap_cmp_fn)patch_util_cmp, NULL);
 	int i;
 
-	hashmap_init(&map, (hashmap_cmp_fn)patch_util_cmp, NULL, 0);
-
 	/* First, add the patches of a to a hash map */
 	for (i = 0; i < a->nr; i++) {
 		struct patch_util *util = a->items[i].util;
@@ -266,7 +264,7 @@ static void find_exact_matches(struct string_list *a, struct string_list *b)
 		}
 	}
 
-	hashmap_free(&map);
+	hashmap_clear(&map);
 }
 
 static void diffsize_consume(void *data, char *line, unsigned long len)
diff --git a/ref-filter.c b/ref-filter.c
index 6476686fea..aa260bfd09 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2230,7 +2230,7 @@ void ref_array_clear(struct ref_array *array)
 	used_atom_cnt = 0;
 
 	if (ref_to_worktree_map.worktrees) {
-		hashmap_free_entries(&(ref_to_worktree_map.map),
+		hashmap_clear_and_free(&(ref_to_worktree_map.map),
 					struct ref_to_worktree_entry, ent);
 		free_worktrees(ref_to_worktree_map.worktrees);
 		ref_to_worktree_map.worktrees = NULL;
diff --git a/revision.c b/revision.c
index aa62212040..c6e169e3eb 100644
--- a/revision.c
+++ b/revision.c
@@ -124,11 +124,6 @@ static int path_and_oids_cmp(const void *hashmap_cmp_fn_data,
 	return strcmp(e1->path, e2->path);
 }
 
-static void paths_and_oids_init(struct hashmap *map)
-{
-	hashmap_init(map, path_and_oids_cmp, NULL, 0);
-}
-
 static void paths_and_oids_clear(struct hashmap *map)
 {
 	struct hashmap_iter iter;
@@ -139,7 +134,7 @@ static void paths_and_oids_clear(struct hashmap *map)
 		free(entry->path);
 	}
 
-	hashmap_free_entries(map, struct path_and_oids_entry, ent);
+	hashmap_clear_and_free(map, struct path_and_oids_entry, ent);
 }
 
 static void paths_and_oids_insert(struct hashmap *map,
@@ -213,7 +208,7 @@ void mark_trees_uninteresting_sparse(struct repository *r,
 				     struct oidset *trees)
 {
 	unsigned has_interesting = 0, has_uninteresting = 0;
-	struct hashmap map;
+	struct hashmap map = HASHMAP_INIT(path_and_oids_cmp, NULL);
 	struct hashmap_iter map_iter;
 	struct path_and_oids_entry *entry;
 	struct object_id *oid;
@@ -237,8 +232,6 @@ void mark_trees_uninteresting_sparse(struct repository *r,
 	if (!has_uninteresting || !has_interesting)
 		return;
 
-	paths_and_oids_init(&map);
-
 	oidset_iter_init(trees, &iter);
 	while ((oid = oidset_iter_next(&iter))) {
 		struct tree *tree = lookup_tree(r, oid);
diff --git a/sequencer.c b/sequencer.c
index 221e98721d..8909a46770 100644
--- a/sequencer.c
+++ b/sequencer.c
@@ -5085,7 +5085,7 @@ static int make_script_with_merges(struct pretty_print_context *pp,
 
 	oidmap_free(&commit2todo, 1);
 	oidmap_free(&state.commit2label, 1);
-	hashmap_free_entries(&state.labels, struct labels_entry, entry);
+	hashmap_clear_and_free(&state.labels, struct labels_entry, entry);
 	strbuf_release(&state.buf);
 
 	return 0;
@@ -5601,7 +5601,7 @@ int todo_list_rearrange_squash(struct todo_list *todo_list)
 	for (i = 0; i < todo_list->nr; i++)
 		free(subjects[i]);
 	free(subjects);
-	hashmap_free_entries(&subject2item, struct subject2item_entry, entry);
+	hashmap_clear_and_free(&subject2item, struct subject2item_entry, entry);
 
 	clear_commit_todo_item(&commit_todo);
 
diff --git a/strmap.c b/strmap.c
new file mode 100644
index 0000000000..4fb9f6100e
--- /dev/null
+++ b/strmap.c
@@ -0,0 +1,178 @@
+#include "git-compat-util.h"
+#include "strmap.h"
+#include "mem-pool.h"
+
+int cmp_strmap_entry(const void *hashmap_cmp_fn_data,
+		     const struct hashmap_entry *entry1,
+		     const struct hashmap_entry *entry2,
+		     const void *keydata)
+{
+	const struct strmap_entry *e1, *e2;
+
+	e1 = container_of(entry1, const struct strmap_entry, ent);
+	e2 = container_of(entry2, const struct strmap_entry, ent);
+	return strcmp(e1->key, e2->key);
+}
+
+static struct strmap_entry *find_strmap_entry(struct strmap *map,
+					      const char *str)
+{
+	struct strmap_entry entry;
+	hashmap_entry_init(&entry.ent, strhash(str));
+	entry.key = str;
+	return hashmap_get_entry(&map->map, &entry, ent, NULL);
+}
+
+void strmap_init(struct strmap *map)
+{
+	strmap_init_with_options(map, NULL, 1);
+}
+
+void strmap_init_with_options(struct strmap *map,
+			      struct mem_pool *pool,
+			      int strdup_strings)
+{
+	hashmap_init(&map->map, cmp_strmap_entry, NULL, 0);
+	map->pool = pool;
+	map->strdup_strings = strdup_strings;
+}
+
+static void strmap_free_entries_(struct strmap *map, int free_values)
+{
+	struct hashmap_iter iter;
+	struct strmap_entry *e;
+
+	if (!map)
+		return;
+
+	if (!free_values && map->pool)
+		/* Memory other than util is owned by and freed with the pool */
+		return;
+
+	/*
+	 * We need to iterate over the hashmap entries and free
+	 * e->key and e->value ourselves; hashmap has no API to
+	 * take care of that for us.  Since we're already iterating over
+	 * the hashmap, though, might as well free e too and avoid the need
+	 * to make some call into the hashmap API to do that.
+	 */
+	hashmap_for_each_entry(&map->map, &iter, e, ent) {
+		if (free_values)
+			free(e->value);
+		if (!map->pool)
+			free(e);
+	}
+}
+
+void strmap_clear(struct strmap *map, int free_values)
+{
+	strmap_free_entries_(map, free_values);
+	hashmap_clear(&map->map);
+}
+
+void strmap_partial_clear(struct strmap *map, int free_values)
+{
+	strmap_free_entries_(map, free_values);
+	hashmap_partial_clear(&map->map);
+}
+
+static struct strmap_entry *create_entry(struct strmap *map,
+					 const char *str,
+					 void *data)
+{
+	struct strmap_entry *entry;
+
+	if (map->strdup_strings) {
+		if (!map->pool) {
+			FLEXPTR_ALLOC_STR(entry, key, str);
+		} else {
+			size_t len = st_add(strlen(str), 1); /* include NUL */
+			entry = mem_pool_alloc(map->pool,
+					       st_add(sizeof(*entry), len));
+			memcpy(entry + 1, str, len);
+			entry->key = (void *)(entry + 1);
+		}
+	} else if (!map->pool) {
+		entry = xmalloc(sizeof(*entry));
+	} else {
+		entry = mem_pool_alloc(map->pool, sizeof(*entry));
+	}
+	hashmap_entry_init(&entry->ent, strhash(str));
+	if (!map->strdup_strings)
+		entry->key = str;
+	entry->value = data;
+	return entry;
+}
+
+void *strmap_put(struct strmap *map, const char *str, void *data)
+{
+	struct strmap_entry *entry = find_strmap_entry(map, str);
+
+	if (entry) {
+		void *old = entry->value;
+		entry->value = data;
+		return old;
+	}
+
+	entry = create_entry(map, str, data);
+	hashmap_add(&map->map, &entry->ent);
+	return NULL;
+}
+
+struct strmap_entry *strmap_get_entry(struct strmap *map, const char *str)
+{
+	return find_strmap_entry(map, str);
+}
+
+void *strmap_get(struct strmap *map, const char *str)
+{
+	struct strmap_entry *entry = find_strmap_entry(map, str);
+	return entry ? entry->value : NULL;
+}
+
+int strmap_contains(struct strmap *map, const char *str)
+{
+	return find_strmap_entry(map, str) != NULL;
+}
+
+void strmap_remove(struct strmap *map, const char *str, int free_value)
+{
+	struct strmap_entry entry, *ret;
+	hashmap_entry_init(&entry.ent, strhash(str));
+	entry.key = str;
+	ret = hashmap_remove_entry(&map->map, &entry, ent, NULL);
+	if (!ret)
+		return;
+	if (free_value)
+		free(ret->value);
+	if (!map->pool)
+		free(ret);
+}
+
+void strintmap_incr(struct strintmap *map, const char *str, intptr_t amt)
+{
+	struct strmap_entry *entry = find_strmap_entry(&map->map, str);
+	if (entry) {
+		intptr_t *whence = (intptr_t*)&entry->value;
+		*whence += amt;
+	}
+	else
+		strintmap_set(map, str, map->default_value + amt);
+}
+
+int strset_add(struct strset *set, const char *str)
+{
+	/*
+	 * Cannot use strmap_put() because it'll return NULL in both cases:
+	 *   - cannot find str: NULL means "not found"
+	 *   - does find str: NULL is the value associated with str
+	 */
+	struct strmap_entry *entry = find_strmap_entry(&set->map, str);
+
+	if (entry)
+		return 0;
+
+	entry = create_entry(&set->map, str, NULL);
+	hashmap_add(&set->map.map, &entry->ent);
+	return 1;
+}
diff --git a/strmap.h b/strmap.h
new file mode 100644
index 0000000000..c4c104411b
--- /dev/null
+++ b/strmap.h
@@ -0,0 +1,268 @@
+#ifndef STRMAP_H
+#define STRMAP_H
+
+#include "hashmap.h"
+
+struct mem_pool;
+struct strmap {
+	struct hashmap map;
+	struct mem_pool *pool;
+	unsigned int strdup_strings:1;
+};
+
+struct strmap_entry {
+	struct hashmap_entry ent;
+	const char *key;
+	void *value;
+	/* strmap_entry may be allocated extra space to store the key at end */
+};
+
+int cmp_strmap_entry(const void *hashmap_cmp_fn_data,
+		     const struct hashmap_entry *entry1,
+		     const struct hashmap_entry *entry2,
+		     const void *keydata);
+
+#define STRMAP_INIT { \
+			.map = HASHMAP_INIT(cmp_strmap_entry, NULL),  \
+			.strdup_strings = 1,                          \
+		    }
+#define STRINTMAP_INIT { \
+			.map = STRMAP_INIT,   \
+			.default_value = 0,   \
+		       }
+#define STRSET_INIT { .map = STRMAP_INIT }
+
+/*
+ * Initialize the members of the strmap.  Any keys added to the strmap will
+ * be strdup'ed with their memory managed by the strmap.
+ */
+void strmap_init(struct strmap *map);
+
+/*
+ * Same as strmap_init, but for those who want to control the memory management
+ * carefully instead of using the default of strdup_strings=1 and pool=NULL.
+ */
+void strmap_init_with_options(struct strmap *map,
+			      struct mem_pool *pool,
+			      int strdup_strings);
+
+/*
+ * Remove all entries from the map, releasing any allocated resources.
+ */
+void strmap_clear(struct strmap *map, int free_values);
+
+/*
+ * Similar to strmap_clear() but leaves map->map->table allocated and
+ * pre-sized so that subsequent uses won't need as many rehashings.
+ */
+void strmap_partial_clear(struct strmap *map, int free_values);
+
+/*
+ * Insert "str" into the map, pointing to "data".
+ *
+ * If an entry for "str" already exists, its data pointer is overwritten, and
+ * the original data pointer returned. Otherwise, returns NULL.
+ */
+void *strmap_put(struct strmap *map, const char *str, void *data);
+
+/*
+ * Return the strmap_entry mapped by "str", or NULL if there is not such
+ * an item in map.
+ */
+struct strmap_entry *strmap_get_entry(struct strmap *map, const char *str);
+
+/*
+ * Return the data pointer mapped by "str", or NULL if the entry does not
+ * exist.
+ */
+void *strmap_get(struct strmap *map, const char *str);
+
+/*
+ * Return non-zero iff "str" is present in the map. This differs from
+ * strmap_get() in that it can distinguish entries with a NULL data pointer.
+ */
+int strmap_contains(struct strmap *map, const char *str);
+
+/*
+ * Remove the given entry from the strmap.  If the string isn't in the
+ * strmap, the map is not altered.
+ */
+void strmap_remove(struct strmap *map, const char *str, int free_value);
+
+/*
+ * Return how many entries the strmap has.
+ */
+static inline unsigned int strmap_get_size(struct strmap *map)
+{
+	return hashmap_get_size(&map->map);
+}
+
+/*
+ * Return whether the strmap is empty.
+ */
+static inline int strmap_empty(struct strmap *map)
+{
+	return strmap_get_size(map) == 0;
+}
+
+/*
+ * iterate through @map using @iter, @var is a pointer to a type strmap_entry
+ */
+#define strmap_for_each_entry(mystrmap, iter, var)	\
+	hashmap_for_each_entry(&(mystrmap)->map, iter, var, ent)
+
+
+/*
+ * strintmap:
+ *    A map of string -> int, typecasting the void* of strmap to an int.
+ *
+ * Primary differences:
+ *    1) Since the void* value is just an int in disguise, there is no value
+ *       to free.  (Thus one fewer argument to strintmap_clear)
+ *    2) strintmap_get() returns an int, or returns the default_value if the
+ *       key is not found in the strintmap.
+ *    3) No strmap_put() equivalent; strintmap_set() and strintmap_incr()
+ *       instead.
+ */
+
+struct strintmap {
+	struct strmap map;
+	int default_value;
+};
+
+#define strintmap_for_each_entry(mystrmap, iter, var)	\
+	strmap_for_each_entry(&(mystrmap)->map, iter, var)
+
+static inline void strintmap_init(struct strintmap *map, int default_value)
+{
+	strmap_init(&map->map);
+	map->default_value = default_value;
+}
+
+static inline void strintmap_init_with_options(struct strintmap *map,
+					       int default_value,
+					       struct mem_pool *pool,
+					       int strdup_strings)
+{
+	strmap_init_with_options(&map->map, pool, strdup_strings);
+	map->default_value = default_value;
+}
+
+static inline void strintmap_clear(struct strintmap *map)
+{
+	strmap_clear(&map->map, 0);
+}
+
+static inline void strintmap_partial_clear(struct strintmap *map)
+{
+	strmap_partial_clear(&map->map, 0);
+}
+
+static inline int strintmap_contains(struct strintmap *map, const char *str)
+{
+	return strmap_contains(&map->map, str);
+}
+
+static inline void strintmap_remove(struct strintmap *map, const char *str)
+{
+	return strmap_remove(&map->map, str, 0);
+}
+
+static inline int strintmap_empty(struct strintmap *map)
+{
+	return strmap_empty(&map->map);
+}
+
+static inline unsigned int strintmap_get_size(struct strintmap *map)
+{
+	return strmap_get_size(&map->map);
+}
+
+/*
+ * Returns the value for str in the map.  If str isn't found in the map,
+ * the map's default_value is returned.
+ */
+static inline int strintmap_get(struct strintmap *map, const char *str)
+{
+	struct strmap_entry *result = strmap_get_entry(&map->map, str);
+	if (!result)
+		return map->default_value;
+	return (intptr_t)result->value;
+}
+
+static inline void strintmap_set(struct strintmap *map, const char *str,
+				 intptr_t v)
+{
+	strmap_put(&map->map, str, (void *)v);
+}
+
+/*
+ * Increment the value for str by amt.  If str isn't in the map, add it and
+ * set its value to default_value + amt.
+ */
+void strintmap_incr(struct strintmap *map, const char *str, intptr_t amt);
+
+/*
+ * strset:
+ *    A set of strings.
+ *
+ * Primary differences with strmap:
+ *    1) The value is always NULL, and ignored.  As there is no value to free,
+ *       there is one fewer argument to strset_clear
+ *    2) No strset_get() because there is no value.
+ *    3) No strset_put(); use strset_add() instead.
+ */
+
+struct strset {
+	struct strmap map;
+};
+
+#define strset_for_each_entry(mystrset, iter, var)	\
+	strmap_for_each_entry(&(mystrset)->map, iter, var)
+
+static inline void strset_init(struct strset *set)
+{
+	strmap_init(&set->map);
+}
+
+static inline void strset_init_with_options(struct strset *set,
+					    struct mem_pool *pool,
+					    int strdup_strings)
+{
+	strmap_init_with_options(&set->map, pool, strdup_strings);
+}
+
+static inline void strset_clear(struct strset *set)
+{
+	strmap_clear(&set->map, 0);
+}
+
+static inline void strset_partial_clear(struct strset *set)
+{
+	strmap_partial_clear(&set->map, 0);
+}
+
+static inline int strset_contains(struct strset *set, const char *str)
+{
+	return strmap_contains(&set->map, str);
+}
+
+static inline void strset_remove(struct strset *set, const char *str)
+{
+	return strmap_remove(&set->map, str, 0);
+}
+
+static inline int strset_empty(struct strset *set)
+{
+	return strmap_empty(&set->map);
+}
+
+static inline unsigned int strset_get_size(struct strset *set)
+{
+	return strmap_get_size(&set->map);
+}
+
+/* Returns 1 if str is added to the set; returns 0 if str was already in set */
+int strset_add(struct strset *set, const char *str);
+
+#endif /* STRMAP_H */
diff --git a/submodule-config.c b/submodule-config.c
index c569e22aa3..f502505566 100644
--- a/submodule-config.c
+++ b/submodule-config.c
@@ -103,8 +103,8 @@ static void submodule_cache_clear(struct submodule_cache *cache)
 				ent /* member name */)
 		free_one_config(entry);
 
-	hashmap_free_entries(&cache->for_path, struct submodule_entry, ent);
-	hashmap_free_entries(&cache->for_name, struct submodule_entry, ent);
+	hashmap_clear_and_free(&cache->for_path, struct submodule_entry, ent);
+	hashmap_clear_and_free(&cache->for_name, struct submodule_entry, ent);
 	cache->initialized = 0;
 	cache->gitmodules_read = 0;
 }
diff --git a/t/helper/test-hashmap.c b/t/helper/test-hashmap.c
index f38706216f..36ff07bd4b 100644
--- a/t/helper/test-hashmap.c
+++ b/t/helper/test-hashmap.c
@@ -110,7 +110,7 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
 				hashmap_add(&map, &entries[i]->ent);
 			}
 
-			hashmap_free(&map);
+			hashmap_clear(&map);
 		}
 	} else {
 		/* test map lookups */
@@ -130,7 +130,7 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
 			}
 		}
 
-		hashmap_free(&map);
+		hashmap_clear(&map);
 	}
 }
 
@@ -151,12 +151,11 @@ static void perf_hashmap(unsigned int method, unsigned int rounds)
 int cmd__hashmap(int argc, const char **argv)
 {
 	struct strbuf line = STRBUF_INIT;
-	struct hashmap map;
 	int icase;
+	struct hashmap map = HASHMAP_INIT(test_entry_cmp, &icase);
 
 	/* init hash map */
 	icase = argc > 1 && !strcmp("ignorecase", argv[1]);
-	hashmap_init(&map, test_entry_cmp, &icase, 0);
 
 	/* process commands from stdin */
 	while (strbuf_getline(&line, stdin) != EOF) {
@@ -262,6 +261,6 @@ int cmd__hashmap(int argc, const char **argv)
 	}
 
 	strbuf_release(&line);
-	hashmap_free_entries(&map, struct test_entry, ent);
+	hashmap_clear_and_free(&map, struct test_entry, ent);
 	return 0;
 }